On-line Detection of Magnet Demagnetization in Asymmetrical Six-Phase Surface-Mounted Permanent Magnet Synchronous Motor Drives

Mengoni, Michele; Vancini, Luca; Tani, A.; Gritli, Y.; Zarri, L.; Rossi, Claudio

doi:10.1109/demped.2019.8864881

Cited by 5 publications

(13 citation statements)

References 16 publications

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“…Irreversible demagnetization in PMSMs may take place in various manners [74,583]. If it affects the entire volume of all the magnets equally, it is referred to as uniform demagnetization.…”

Section: Permanent-magnet Demagnetizationmentioning

confidence: 99%

“…If it affects to a greater extent some of the magnet parts (e.g., trailing edges), or just some of the magnets, it is called local demagnetization. The former (uniform) implies a reduction in the amplitude of the back-EMF waveform, and, hence, a decrease in the output torque for given stator current [74,129,177]. The latter (local) additionally leads to a distortion of the back-EMF waveform and to torque ripple [68,74,77].…”

Section: Permanent-magnet Demagnetizationmentioning

confidence: 99%

“…The former (uniform) implies a reduction in the amplitude of the back-EMF waveform, and, hence, a decrease in the output torque for given stator current [74,129,177]. The latter (local) additionally leads to a distortion of the back-EMF waveform and to torque ripple [68,74,77]. The most relevant causes, detection methods and tolerance approaches for magnet demagnetization are illustrated in Figure 39.…”

Section: Permanent-magnet Demagnetizationmentioning

confidence: 99%

“…This problem can arise as a consequence of various reasons. For instance, it can be caused by manufacturing defects, corrosion or mechanical stress (e.g., cracked magnets) [74,75,78,583]. Nonetheless, one of the most common origins of demagnetization is excessive temperature [72,74,75,78,129,177,267,583], e.g., due to a failure of the machine cooling system or to large current.…”

Section: Causes Of Permanent-magnet Demagnetizationmentioning

confidence: 99%

“…For instance, it can be caused by manufacturing defects, corrosion or mechanical stress (e.g., cracked magnets) [74,75,78,583]. Nonetheless, one of the most common origins of demagnetization is excessive temperature [72,74,75,78,129,177,267,583], e.g., due to a failure of the machine cooling system or to large current. The latter may be produced, e.g., by stator SCs [75,78,129,176,177,267], converter SCs [75,78,583], heavy load [129], or position-sensor faults [176,177].…”

Section: Causes Of Permanent-magnet Demagnetizationmentioning

confidence: 99%

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A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 1: General Overview Considering Multiple Fault Types

et al. 2022

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Multiphase drives offer enhanced fault-tolerant capabilities compared with conventional three-phase ones. Their phase redundancy makes them able to continue running in the event of faults (e.g., open/short-circuits) in certain phases. Moreover, their greater number of degrees of freedom permits improving diagnosis and performance, not only under faults affecting individual phases, but also under those affecting the machine/drive as a whole. That is the case of failures in the dc link, resolver/encoder, control unit, cooling system, etc. Accordingly, multiphase drives are becoming remarkable contenders for applications where high reliability is required, such as electric vehicles and standalone/off-shore generation. Actually, the literature on the subject has grown exponentially in recent years. Various review papers have been published, but none of them currently cover the state-of-the-art in a comprehensive and up-to-date fashion. This two-part paper presents an overview concerning fault tolerance in multiphase drives. Hundreds of citations are classified and critically discussed. Although the emphasis is put on fault tolerance, fault detection/diagnosis is also considered to some extent, because of its importance in fault-tolerant drives. The most important recent advances, emerging trends and open challenges are also identified. Part 1 provides a comprehensive survey considering numerous kinds of faults, whereas Part 2 is focused on phase/switch open-circuit failures.

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“…Irreversible demagnetization in PMSMs may take place in various manners [74,583]. If it affects the entire volume of all the magnets equally, it is referred to as uniform demagnetization.…”

Section: Permanent-magnet Demagnetizationmentioning

confidence: 99%